This Calculator Will Help You Convert Your Apartment into a Ball Pit


These days, it seems like everyone wants to get back a piece of their youth. Whether it's adult coloring books or wine in juice boxes, nostalgic products and events are everywhere. But alongside all the fun things that come with being a child, there are also restrictive rules and a strict bedtime. Being an adult is great because we can eat ice cream for dinner, watch R-rated movies, or fill our apartments with playpen balls if we want

The National Building Museum in Washington D.C. recently filled their 10,000-square-foot Great Hall with white playpen balls for guests of all ages to play in. The event looked like great fun, but if you missed it, please know you can recreate it in your own living space. 

It's safe to assume the only reason why you're not reading this from the bottom of a ball pit right now is because you don't know how many balls to buy. It's risky committing to purchasing a bulk order of playpen balls only to realize you can't actually afford to fill the whole room. Or what if you buy too many? This special calculator will make sure you know exactly what you're getting into. 

Inspired by this xkcd comic, the calculator takes a number of factors into consideration—such as apartment area, packing efficiency, and the radius and price of each ball—and then calculates how much money your personal ball pit will set you back. The website will either save you from a costly mistake or illuminate a very affordable way to double your property's worth. 

If you need the metric system, please see the Berge version. And if you're looking to actually put this calculator to use, these balls should do the trick

Netflix's Most-Binged Shows of 2017, Ranked

Netflix might know your TV habits better than you do. Recently, the entertainment company's normally tight-lipped number-crunchers looked at user data collected between November 1, 2016 and November 1, 2017 to see which series people were powering through and which ones they were digesting more slowly. By analyzing members’ average daily viewing habits, they were able to determine which programs were more likely to be “binged” (or watched for more than two hours per day) and which were more often “savored” (or watched for less than two hours per day) by viewers.

They found that the highest number of Netflix bingers glutted themselves on the true crime parody American Vandal, followed by the Brazilian sci-fi series 3%, and the drama-mystery 13 Reasons Why. Other shows that had viewers glued to the couch in 2017 included Anne with an E, the Canadian series based on L. M. Montgomery's 1908 novel Anne of Green Gables, and the live-action Archie comics-inspired Riverdale.

In contrast, TV shows that viewers enjoyed more slowly included the Emmy-winning drama The Crown, followed by Big Mouth, Neo Yokio, A Series of Unfortunate Events, GLOW, Friends from College, and Ozark.

There's a dark side to this data, though: While the company isn't around to judge your sweatpants and the chip crumbs stuck to your couch, Netflix is privy to even your most embarrassing viewing habits. The company recently used this info to publicly call out a small group of users who turned their binges into full-fledged benders:

Oh, and if you're the one person in Antarctica binging Shameless, the streaming giant just outed you, too.

Netflix broke down their full findings in the infographic below and, Big Brother vibes aside, the data is pretty fascinating. It even includes survey data on which shows prompted viewers to “Netflix cheat” on their significant others and which shows were enjoyed by the entire family.

Netflix infographic "The Year in Bingeing"
Can You Spot the Christmas Pudding?

Whether it’s a sheep hanging out with Santa Claus or a panda bear hiding among some snowmen, regular Mental Floss readers know that hidden picture brainteasers are one of our favorite things. And the optical experts at have released a delicious one, just in time for Christmas. Somewhere in the midst of all these holiday-themed goodies above, there’s a holiday pudding just waiting to be discovered. Can you spot it? Your time starts … now.

If you give up, or are the kind of person who reads the last page of a book before the first one and just wants to know the answer, scroll down to see where it’s hiding.



More from mental floss studios